Thomas and Alito didn’t hold that Texas had standing because an injury was done to it; they simply hold that SCOTUS is obliged to hear all cases in which it has original jurisdiction. Both also went out of their way to note that they would not have granted relief.
How can a judge take the position "lack of standing" without first analyzing the evidence?
You're putting the carraige before the horse.
"Oh hai guis! I haven't look at the evidence but your case has no standingz!!!"
Thomas and Alito didn’t hold that Texas had standing because an injury was done to it; they simply hold that SCOTUS is obliged to hear all cases in which it has original jurisdiction. Both also went out of their way to note that they would not have granted relief.